The authors also find uplift rates are similar between the Channel Islands, Barbados, and the Florida Keys, and were only ~0.1-0.2 mm/year over the past ~15,000 years, but began to level off to rates of less than half that around 10,000 years ago to the present sea levels.
The University of Colorado, however, adds a highly controversial glacial isostatic adjustment adjustment of 0.3mm/yr to global sea level rise, which may be exaggerated and artificially increasing estimates of sea level rise due to thermal expansion or ice melt.
The paper also shows that sea levels of the Channel Islands were naturally 20 meters [66 feet] higher during the last interglacial ~120,000 years ago. The paper joins many others demonstrating sea levels during at least 4 prior interglacials over the past 500,000 years were higher than during the present interglacial period [up to 31 feet higher during the last interglacial alone]. Thus, there is no evidence that the [decelerating] sea level rise over the past ~20,000 years is unusual, unprecedented, or unnatural.
|The positive global sea level rise trend from satellite altimetry is almost entirely due to an apparent huge wind-driven "bulge" located in the Western equatorial Pacific region. Conversely, all areas shown in blue have experienced a drop in altimetric sea levels [different from relative sea levels which are more dependent upon land height changes] from 1993-2010, including most of the East and West coasts of North and South America. This data is after addition of the likely exaggerated GIA of 0.3mm/yr.|
Global sea levels have been naturally rising for ~20,000 years and have decelerated over the past 8,000 years, decelerated over the 20th century, decelerated 31% since 2002 and decelerated 44% since 2004 to less than 7 inches per century. There is no evidence of an acceleration of sea level rise, and therefore no evidence of any effect of mankind on sea levels. Sea level rise is primarily a local phenomenon related to land subsidence, not CO2 levels. Therefore, areas like Miami, Florida and the Florida Keys which are built on soft limestone have higher rates of relative sea level rise, but this has absolutely nothing to do with man-made CO2.